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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0350e6a6b363de42439e5e535683fd856f92248be987649d3694c24358e025dc' 
  AND token = 'DjUF5F9osjQBR8eS8CWwXQsO/HGIeGB234dSAA46Xr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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