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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aff7591b819a0aa35283b2f1531b7007f0520c284fae99415358af834eb0e8c' 
  AND token = 'FNq7chs57LiV/+1v4NNc6sV0jlH9RrkurJ5DyLS7vhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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