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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cf13521da1d58a8e84b7d3658333a98d2080d329ce71f0fcc6326daae32d14' 
  AND token = 'Oe+9zwta2yEKZhEZHZU+frUftGte7S7KPwnK4guHm/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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