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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b33658b8c46ead6de9055b3e646a375ceabf74d1b8691c1ef7f85ef63b04578' 
  AND token = 'l5hmJ/l41dyw8DMsywQBmHzQeCYF/alQFkPNw6VaQ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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