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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6c10c6433142dac7a95c0be94089d75e65fc243049e48d78c9e7a816798923' 
  AND token = 'fIoSX7eHH2FkWggDjxoUe8qeyzpAexv0AL7Hdj2hd8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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