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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20d90f72bf0ba9b6cab3a90af5cd6141468ea2209e6fccc603dc7d06be7cccd' 
  AND token = 'oBKm+1lsTBG70M2cm1PyRujSDnNUskU3mgS/RdAdZ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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