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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b962a264621989e1ba5e5a7015df31f4b2a7f693a608992d83061c46c9c61cc9' 
  AND token = 'n5TqO04e9+LFn1axYJ1DA1QO1ruqxX+Qb5SnRlJGd4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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