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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24ad2cfa0406b2898d277c8b4e63af842b274989eeb5dd1f3a61c2ead55b7b2' 
  AND token = 'MQ29UxKCJVGZLOKk8K8VxoIgWIteObZvOI5YDiijHMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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