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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeda80399cd4d7aedd91555175104b4d4480cf977bef47477a4b1e4e2ee64399' 
  AND token = 'Rjk0pQaaeCgHpeZ6J7gjJEGax5+ka0WEm9OUvBLx9jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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