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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3defaa8198844cebf93f45d1f0f874dee23597e93d56e0c7ccfcc21a5d8a31' 
  AND token = 'GCYmw+QeHaWHG2GUtV3gWYsKFcFv5V0YdXfkUX+0Uag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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