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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932101d0678ddac2f89144e4256b073238dcd020bb7e8c446c807ba6efa356c' 
  AND token = 'vtG/pacsKgEGEc7qx1gT81vxHumUwMB/K5S8tzTdzM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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