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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853f92b974fcd1d7e7f65973829fb5328d68fc72db46515092dd2af8bc019662' 
  AND token = 'T7xDJy7ebpM9Yirkqwi6yxqeJV+/fRJm0eS4WzYnn7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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