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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace59fad33137501d8ca25d87b9ce9c0a9b3bd694daaa15ed0b01372ae9b8efc' 
  AND token = 'SXwEcUqsVohaT9fLaQ2F84vnNO1NaneBes/lU2klxZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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