SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215ace780fbf26ef2438127b2b4abb9bf393784630fd4c719420d60ad412835a' 
  AND token = '8zEYt8pBtHD8abOFSMezsZs0GA3L3vJTKQVgO9v2xHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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