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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8331efab0bb771d632989cae1b872f84fdd1abc54d9fb8a26fd2ce97300927' 
  AND token = 'svWssKk2oYyprHcUpyUvFwhhTHcOVZcMB7ksXmI76Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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