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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36241d17636b0f771bc36a1a8bb1ad39020d9a5e237c677915c0fc7ca1fbe8b8' 
  AND token = 'NkqDrRdD+t5nCp0xwYaOSqw5dulTmZ2lQBtzLAAJNzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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