SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fda687e3fa3c74e9a0da5e86b38dcdee61363ade1c52a5b1bb66cf92123a124' 
  AND token = 'IDqJCn+nUFpuOPo/lDutzHPUEob6QWzTfYBzF7WGxCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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