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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936a530b9d9799f77a1d6192e55d55de7ae029516b5833912ed22d9a770a59aa' 
  AND token = 'fun7gGqTeopIpLq8rARjpVxJfQ/EAomlXT9atFuGjFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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