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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef60b8c1d0c802a82c0655fab5f324bcfbfb226f6e97b08215af3066ee315031' 
  AND token = 'VMHtdzEYZGLq6DP0KK9ewKFNectmq/6F7mbGa/3eZB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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