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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000c9ba2f36eaacf63b1d343a92367f737d9ee67929162a53e5f3834d2e5e632' 
  AND token = 'ZK3SdON4vGxwQ8c4Jw7OnJ6bXlnC4MNqmeWRsMahgd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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