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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd47eae6f9131f4cc769433eb5b6468edf80b42c3f553eb1d02cbac2c1f72c38' 
  AND token = 'mfGqW1QS4c4RQ45uC4+zGHL5zcdKVnA3LPy8JWO38+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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