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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7eeb110417f9005a5017e2a21687ac2e51c5f91c4d3a559a6545967c3990af' 
  AND token = 'qKXX99dNwyuyE3zQ4eJcHEFh10mF6Cvf6/9x5KghFdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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