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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336fc23dd5275ea5e1d964f064bd58c8a63437f01f172c3a0a6a45d2ad852ae2' 
  AND token = 'mIWKAkhtCkdRDv61MqhI66LMc6lOebYoyjWdpXVOPD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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