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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7777891a90461331f4a57402ed37a7d307575ba57db2988519ed3c2f004d789b' 
  AND token = '+4ls3Ysl6z+FcaUIFGhZ/1byYae1vKjf74Eveh3hfVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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