SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3106bdf5adc79b4cf768d318e815480b6c988a59e49fbd05de117a3dfb11cc70' 
  AND token = 'G1h2EvkHks6ylVNJMJEkQuK1eBqpD6Bwax/ivjyw6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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