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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee3a55c61f6671f998aa4e3587bfd5178aeba4b9ac2656e8a090b738bdcada5' 
  AND token = 'Um0qkxno3LzALfiX/KXO9V/uva0GIJPv/8/+SiOCD34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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