SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb97a08a0b8a6bc94b4f4e73f9838e61637c281421baceb34632652f4bc37321' 
  AND token = 'at1+izu1L8bPu7SziF/Yj1NxeoFgkqhloKNB/lKJujg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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