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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082299114eed0dfdaa8842a907600fbe5507484019dc64c255f7ecb48cc71c45' 
  AND token = 'N5LDyz0tZPKt9vwiFrKYoOmmYXrDpD5oFv2pMcd0Tdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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