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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe429dbf0957362e14421c638c7cbfdd3ac585b26a7252af1d9b8c3a38cbb569' 
  AND token = 'PBT4L+IQcuUe6DramfR8TM5jQki6db1jXjrrscTmYHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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