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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f9ac8d8e379e4f87ebbaf095dd53088c57edc11565c80fb7489537cae06104' 
  AND token = 'rvehJytfuVFE9AvrSv9V9xe73wrc8bMO3VCu0ffLWIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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