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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db836ff3d48de739d665858654831693b6446f429b47e41626e3feffe1329375' 
  AND token = 'W8Jy6GdFzC9xTGnyrW/hU/31ihkkUXAwStclusrkCHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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