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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206d5fc88f98ed5b8766a4bdf95763b46b3bdaae735c4e23eff94c3e7f7a05d9' 
  AND token = 'QXG13WO1799QETYWoZHUtmqUYZYvbHnvnXFb0W+aZqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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