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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1db0756f88cdfd90e035d7639145896ef92d2967b1762e67e1fcce40008e65' 
  AND token = 'e95c4p7J/wC9Fbn81/ybu0OTbRy8JexU6dzCVXi4jrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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