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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4468c8dac1c6d1612fae5d303c5736371aff23384af06326411925b322ef430c' 
  AND token = 'X3PrzVErHOYOG5UAcIbUc185Zoo7UYm+ZTUv5DF460M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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