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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82341821fea7dc46167b0ffa46321a5d6bcf657d273765106cfcd5a5802699a7' 
  AND token = 'd6U8rtxw6RcCiF2GupJHgQVe+J5rdFTC4OPNk0FYRHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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