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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53be3e2247bd489ae7b31f303add361ef771d7b8cc503ff5f11745ab0d08b36' 
  AND token = '8BSwLdIeobDJRHJJkwf0JH7ltrGgghW+3j3PqVIR4Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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