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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b4cf726fc92f54d950ac49e3fd3dd63b33b74c2273582a0ccf778625bf0d89' 
  AND token = 'Iz/RB+8asNUDHKtaDK5XQKvvTVU3OAPUUE9xXaz0WuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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