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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704504868e87bbcc849ecd5bc89e1a6d26b348d0c05604fdc01d98552c1d6f67' 
  AND token = 'D2M7ZVEzxiVmBkRWRtRPYc+b5/GXbAnHQi4P/oNAI0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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