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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfc94bb51e536b2d181e78982cef94277ee920329981eb779a43deed1fe556c' 
  AND token = '/jfy5CrAsdeHINFaCq0C/St051Mkz3dNH6PvHC0Qncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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