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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '916f3d99173af81d3aee4f9e09d9c7c38299e82678cf2e7fedf00b38f129cb7c' 
  AND token = '1TiA3zsTlG1Dh+ON7fAQbdu7yfTTkf7MACaOeGUqnew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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