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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f65dd509fb7978519870954483cddd552c56c4ac688b4f3d300f082f19e8c4' 
  AND token = 'tqoa7JMjM+M+Wl8+goTfsJP/yN5wcuNX4PC6PfNdGRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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