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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc34b60eb6121b213b25d281c8ba841da4417881ec03c92c9b90513a1987770' 
  AND token = 'Xm37ARFLWtacGTIb0EgL5oWeFV+LNHXJnd/JRXE798k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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