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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3accebfe7a102b2b514c9803eae1e861ac9fa1b3a282afb290e02e4520c6defe' 
  AND token = '/z4KRy7yXq11dh53ixvZxcgfP5TH8YrZNMrwyxnFf+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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