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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073bdc3ab52266b6feaf427615e6174b42a23040af28a50935c89ba93fa741ee' 
  AND token = 'DCP07fGBdTB0ardZzUZ0ojcX1nZB9zJt8vt1x/Qd7wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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