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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e028166117e4db3d04375fe0d77e0c661a862bc8c45be8cd394433d2707387d2' 
  AND token = 'WGeFIHS852oP/yghk7tYB9K5cZiGm9S9mWSDS5umABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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