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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac49ca1ecc7d497851ce93aafcea48844d47faed846528a1a72c080280258bc5' 
  AND token = 'y72AOYyjWIhzP5Fba7ZdpgMrzvAPhc3nKo/MDRZnoYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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