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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009ca1c1f5adaca12d489b7ca2b1890d64caa78d54e270a45fd3e5e372d4fa3a' 
  AND token = 'ozPQjL7Pw+aB9wCt/HiexTwnykDvdV6U/ckHLwKk0dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}