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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f27470031202a2c7c0217883cc76f7e14ab572587bde06c430b348382d3756' 
  AND token = 'Fax3HZE43c4UEjXhGYG4y7YkaQQ+I7Am+4hTSuUw8v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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