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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8b3932005eb0fa834bbd4bb07e58124537eb2e3572ca1aeb6aa8e8d7792236' 
  AND token = 'v2aPE2u69+SJaehIsx2bu5w7/xbCbi/Ekc3zjc4HtSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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