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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9332bccb7c99d2786531eee8169580aeefd0fae56859b682e068eb29cf6c20c3' 
  AND token = 'p8Jp6sg9KBE6FJ7oyQBGItLsQ/10HOgVAS1IjZz/h6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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