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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d12a256f34109ecab0b7d3816d82fc29037157c4afecea4da734d5ff1eebcc' 
  AND token = 'G+NZSsQ7Ad5FoEY6YY71xUfJl13lVx1PkV8HBSS5HrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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