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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304c4f9ade7d0930c0025cdd0b8c727f693f3c21e67620e00c143c64e1cfc1d3' 
  AND token = 'EjgDoEvm9UX6TkHp6n9c6sqUiRARz16IkL5pecHz9Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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