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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6d7f4e5f11aa363e6621d47de4b09a2a370a667a59b337d731a512e870c12d' 
  AND token = 'UTVYey02B1V92izw1m86Jh/rn0YwkxJGg3AYFkOz2NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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