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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bb833590b95b049db04900f204d0ab1a38582d8d82cc83d50d028ffbb40f9f' 
  AND token = 'n+RzpBrSOb9LTlQhe1zFhle0nVRGomADO/878i5SfG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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