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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7fb5ec4b047b3db8142af61274cba6964f6214443e6f88f93ce540c4b4dfed' 
  AND token = '/UPercY+nVLIVwVftPCwgJfyi7X+prTdCeuPBKsI+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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