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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14fb5d73603dd182c221b776cc5c0e98f4a1290b44dec3bf5b049b673b02f68' 
  AND token = '6gX6a1ggV4ulnPkAMhScML90naCu86cZwHVlld2oYbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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