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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9220d1fe0c47d0425dbad6d32c34b8417e7ffca26fb9f13ed5d20c80a34e9e3' 
  AND token = 'T/9fNqt5KEEciLjawMnUFDHn8uld7mDkGjG6jZp3Z34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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