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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83756f3f8cf06b65d807062561fc3291a742b4db29a4d4e222a84e9483f99af4' 
  AND token = 'lntFdd8BjXPrr5dFaT7Q0I36JdKMPaLrFQHE2FRA3nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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