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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed6235ed9ff3ab5f3032471b8381a33c42ccf5510d53b476ec16998786a4b38' 
  AND token = '68Zl1T7x6vkXKm/xKyHO+/o+5UtWlDqBXD5OeWMp408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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