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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6124528aaa05b595f51abb9fc1edcb6773acb7e189986ff17b1fba202e58ac' 
  AND token = '1JFRtNrMx6DyEPYbHUAs7Ck1o5t8pTVXuUCXQ/hUG78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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