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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d8e0c21ebfa339afd876f21ca22acab732a237700acf6bae98a0b67d923ea9' 
  AND token = 'p96LQugQ3q3wIuWJhnlwexAp2e5HAWYEO83qvnnzV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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