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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c3b803cc5e71fc2615fbaa47b136e98be64cbbd6dfbfa6a3329a6df54eb3cb' 
  AND token = '4zj6t61aIWIbFvVqq3zyowsdtnbCl4YzH/uUievUaD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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